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these increased levels were associated with elevated suspended solids concetttra[ions resulting front bailing <br />• the well when water levels were low. The manganese levels documented during 1994 remained clearly <br />within the historical ranges established at this site as did the 1993 values. <br />Spoils <br />Two wells in the backfilled area of Mine 3 (008-SP-4A and 008-SP-SA) were installed in 1985 to monitor <br />water levels and water quality in mine spoils (see Figure 2). One well, 008-SP-4A, remained dry since it <br />was installed. During 1992, t}te well was determined to have a separated casing. As a result, CYCC <br />installed a replacement spoil monitoring well (008-SP-4B) near the northern embankment of Pond M3S (Site <br />76). Due to the tinting of this installation, CYCC did not provide initial monitoring information for the <br />replacement well until the 1993 AHR submittal. <br />Water Levels -Plots of historic water levels itt the two currently monitored Mine 3 spoil wells are presented <br />as Figures 12 and 13 in this report. 1994 water levels occurred at levels typical for these sites. A slightly <br />increasing overall trend appears [o be prevalent in well 008-SP-4B although little data is available to evaluate <br />and the magnitude of the overall change is insignificant. <br />Water Quality -Water quality data for the Mine No. 3 spoil wells is presented on Tables 8, 8a, 9, and 9a. <br />• A plot of historic total dissolved solids concentration for well 008-SP-SA is presented as Figure 14. Water <br />quality constituent concentrations for all parameters monitored at well 008-SP-SA during 1994 were without <br />exception within the established ranges historically associated with this site. Several water quality constituent <br />concentrations noted for well 008-SP-4B during 1994 fell beyond the ranges established to date for this site. <br />The data set for this site covers a relatively short duration and normal ranges are still being established. <br />Newly established tnaxintunt and values noted during 1994 for well 008-OSP-4B include a minimum field <br />pH value of 6.6 measured in March 1994, alkalinity attd bicarbonate concentration ntaxintums of 528 attd <br />644 ntg/1 respectively, and a sodium concentration maximum of 70 mg/I all measured itt May 1994. <br />Dissolved solids concentrations appear highly variable in well 008-SP-SA (see Figure l4). The spoil well <br />water is acalcium-sulfate type with high bicarbonate and relatively low SAR. The water is higher in <br />dissolved solids than the background bedrock levels and spoil spring discharges. The 1994 data does not <br />indicate any significantly high trace metals concentrations. Manganese levels increased significantly itt well <br />008-SP-SA relative to the values remrned during 1993 but remained within the previously established range <br />of values for this constimettt. Manganese levels decreased slightly in well 008-SP-4B relative to the values <br />returned during 1993. <br />Two full suite analyses are required annually from each spoil well. During 1994, the second full suite <br />analyses collected front each well was collected during November 1994 due to ntisuttderstanding <br />regarding the September/October tinting constraint applicable to these sites. This issue Itas been resolved <br />and 1995 sampling will occur in accordance with the approved plan. <br />-4- <br />